/Engine/Source/Runtime/OpenGLDrv/Public/OpenGLDrv.h
Inline copy.
virtual void RHICopyToStagingBuffer ( [FRHIBuffer](API\Runtime\RHI\FRHIBuffer) * SourceBufferRHI, [FRHIStagingBuffer](API\Runtime\RHI\FRHIStagingBuffer) * DestinationStagingBufferRHI, uint32 InOffset, uint32 InNumBytes )